I decided to tear down this device, determine the pin out, and make sure what exact component needed replacing. I figured someone else might benefit from my experience.
Disclaimer: Air Bags. You should know what that means. If you don't, stay away from this.
I did not disconnect anything. But, I kept all arms and other body parts away. I have seen these things blow people out of a car!. http://www.youtube.com/watch?v=b1Qj75pbl8o
Step 1: Remove Cover and Signal Module
After removing the cover, there are only two phillips head screws holding the module in place. As you remove the module, carefully release the cable connector from the rear.
Step 2: Cover Removal Step 1
Step 3: Cover Removal Step 2
Step 4: Circuit Board Map
I have mapped out the circuit board. At least, the items I could determine. The mechanical operation is quite simple. The connectors (more in these later) Slide over the copper traces to complete circuits. There are a couple of special notes.
The first is that there is a black tape covering the copper to create an open circuit.
Also, the speed control is a set of broken copper traces. Each little segment feeds in to a ceramic type item that appears to be resistors in a series or maybe just a solid ceramic device. So, each subsequent selection decreases the resistance. (To control some sort of flip-flop ciruit or just input to a microntroller.)
Step 5: Connectors
I have a little video of the mechanism in operation.
Step 6: Video of Mechanism Internals
Step 7: Connector Pinout
1. Flasher (N/C)
3. Right Blinker
4. Right Blinker
5. Momentary Wiper
6. Wiper Speed Control In
7. Wiper Speed Control Out
8. Battery Ground ( - )
9. Headlight Common
B. Washer Fluid
On the wiper controller - it appears to be just a sensor loop to measure the resistors.
The turn indicators are just on/off. When the mechanism slides one way, it completes the circuit for that signal. The flashing is performed by an electronic flash module. ( I think I saw this referred to as a DLR - but I don't know that that stands for.)
Step 8: Wrap-Up
1. Again - Air Bags! Nuff Said?
2. Make sure you don't wipe the "grease" off the circuit board. That is actually conducting grease. I used a small bladed screwdriver to redistribute the grease on the copper traces that looked brighter than the others.
3. There is a small clip that creates an on/off action for the flasher button. If it falls out, your button won't stay down. Test that after you replace the cover. (Don't wait until you completely replace all the covers !! )
4. Air Bags.